The disclosure belongs to the field of general technology of device, and relates to a connection structure of a bolt and a nut having dumbbell-like shaped asymmetrical bidirectional tapered thread, which solves the problem of poor self-positioning and self-locking of existing threads. An internal thread (6) is a bidirectional tapered hole (41) (non-entity space) on an inner surface of, a cylindrical body (2), an external thread (9) is a bidirectional tapered cone body (71) (material entity) on an outer surface of a columnar body (3), and a complete unit thread is a helical dumbbell-like shaped asymmetrical bidirectional tapered body small in the middle and large in both ends and having a left taper (95) greater than and/or small than a right taper (96).

The disclosure relates to the general technology of devices, and in particular relates to a connection structure of bolt and nut with dumbbell shape bidirectional tapered thread having small left and large right taper. The disclosure solves the problems of poor self-positioning and poor self-locking of existing thread. The disclosure is characterized that an internal thread (6) is a bidirectional tapered hole (41) in an inner surface of a cylindrical body (2) (non-solid space) and an external thread (9) is a bidirectional truncated cone body (71) in an the outer surface of a columnar body (3) (material entity), and each of the complete unit threads thereof is a dumbbell-like shape (94) bidirectional conical body with a left-side taper (95) smaller than a right-side taper (96) in the form of a helical and having a small middle and two large ends.

Disclosed is a dumbbell-like bidirectional tapered bolt-nut threaded connection structure with a large-conicity left side and a small-conicity right side, which solves the problems that the existing thread is poor in the self-positioning and self-locking property. The internal thread (6) is a cylindrical body (2) with a bidirectional tapered hole (41) on the inner surface (non-solid space). The external thread (9) is a columnar body (3) with a bidirectional truncated cone (71) on the outer surface (material entity). The whole unit thread is a spiral dumbbell-like (94) bidirectional tapered body with a small middle part and two large ends, the conicity of the left side (95) is greater than the conicity of the right side (96). The performance mainly depends on the taper surfaces and the conicity size of the threads matching with each other.

The present invention belongs to the technical field of general technology of devices, and relates to olive-like and dumbbell-like asymmetric bidirectional tapered thread connection pairs, which solve the problems of poor self-positioning and self-locking performance of existing threads. An internal thread (6) is a bidirectional tapered hole (41) (non-entity space) in an inner surface of a cylindrical body (2); an external thread (9) is a bidirectional truncated cone body (71) (material entity) on an outer surface of a columnar body (3); and a complete unit thread is a bidirectional tapered body in an olive-like shape (93) and with a left taper (95) greater than a right taper (96) and/or in a dumbbell-like (94) shape and with the left taper (95) smaller than the right taper (96).

The present disclosure belongs to the technical field of general technology of devices, and relates to olive-like and dumbbell-like asymmetric bidirectional tapered thread connection pairs, which solve the problems of poor self-positioning and self-locking performance of existing threads. An internal thread (6) is a bidirectional tapered hole (41) (non-entity space) in an inner surface of a cylindrical body (2); an external thread (9) is a bidirectional truncated cone body (71) (material entity) on an outer surface of a columnar body (3); and a complete unit thread is a bidirectional tapered body in an olive-like shape (93) and with a left taper (95) greater than a right taper (96) and/or in a dumbbell-like (94) shape and with the left taper (95) smaller than the right taper (96).

The disclosure belongs to the technical field of general technology of devices, and relates to an olive-shaped bidirectional tapered thread bolt and nut connection structure having a large left taper and a small right taper, solving the problems of poor self-positioning and self-locking performances of the existing threads. An inner thread (6) is a bidirectional tapered hole (41) on the inner surface of the cylindrical body (2), an external thread (9) is a bidirectional truncated cone body (71) on the outer surface of a columnar body (3), the complete unit threads are both helical olive-like (93) shaped bidirectional tapered bodies which have larger left taper (95) being than right taper (96), and are large in the middle and small in two ends. The performance mainly depends on conical surfaces and tapers of mutually fit thread bodies.

A bolt includes a head portion and a shaft portion. The shaft portion includes an ordinary screw portion that meshes with a nut, and a guide screw portion that is provided on a distal end side of the ordinary screw portion and has a screw thread having a diameter smaller than that of a screw thread of the ordinary screw portion. A protective portion having a diameter larger than a minor diameter of the ordinary screw portion is formed continuously from the guide screw portion at a distal end of the guide screw portion. A pressure flank surface is formed at a distal end of the screw thread of the guide screw portion, but a clearance flank surface is not formed thereat.

A bone screw includes a receiving sleeve having a sleeve wall which forms a seat for a longitudinal support for the surgical connection of adjacent bone screws. The bone screw includes an internal thread. A thread turn of the internal thread has a widened lead-in region on the thread lead-in side.

A male anti-cross threading fastener comprising: a substantially round shank having a lead end, a torque end, and a plurality of male threads around a circumference of the shank, the plurality of male threads comprising: a standard thread around at least a portion of the circumference of the shank and having a standard thread contour, wherein a width and a thread angle of the standard thread enables engagement with corresponding female threads, wherein the major diameter of the standard thread is between a lower major diameter limit and a higher major diameter limit; a transitional thread around at least a portion of the circumference of the shank and having a transitional thread contour with a width and a thread angle similar to the width and thread angle of the standard thread that enables engagement with corresponding female threads; an anti-cross thread around at least a portion of the circumference of the shank and having an anti-cross thread contour and an outside diameter configured to promote alignment of the male anti-cross thread fastener with a female fastener; and a lead thread around at least a portion of the circumference of the shank and having a lead thread contour, and wherein the transitional thread contour has a height that transitions from the lower major diameter limit of the standard thread to the outside diameter of the anti-cross thread.

A bone screw system includes a bone screw having a tulip that forms a seat for a longitudinal support for surgical connection of adjacent bone screws. The tulip has a tulip thread into which a clamping screw is screwed. The clamping screw has a clamping screw thread for locking the longitudinal support by clamping within the seat. The clamping screw thread is provided on the run-in side with a thread chamfer. The thread chamfer is introduced to the clamping screw thread while chamfering a thread elevation in the radial direction.